A wrench featuring a U-shaped opening that grips two opposing faces of a bolt or nut is a common hand tool. This design allows the tool to apply torque to fasten or loosen the fastener. Different sizes accommodate a range of bolt and nut dimensions. A common example is a mechanic using this type of tool to tighten a bolt on an engine component.
The utility of this tool lies in its simplicity and effectiveness for various mechanical tasks. Its prevalence stems from its ease of use and its ability to provide a strong grip. Historically, tools of this design have been fundamental in assembly and repair work across numerous industries, contributing significantly to efficiency and precision.
